Before sending money, double-check that the recipient's information is valid. An IBAN contains all of the information you'll need to complete the transaction correctly.
Make sure you're using the correct code. The transaction will go through even if you provide incorrect information and an actual account exists. Unless the person who received the funds erroneously consents, it will be difficult for the bank to reverse the transaction.
Most banks, on the other hand, use an IBAN checker to ensure that their employees do not make any mistakes when checking for IBA